The redirect URI in the request, https://www.ebike-mag.com/forum/connected_account.php, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/406463691616-asmbbgla51p7de5a3tr789f0ao0k7f3g.apps.googleusercontent.com?project=406463691616